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// Register the function f to run when the document finishes loading.

// If the document has already loaded, run it asynchronously ASAP.

function onLoad(f) {

if (onLoad.loaded) // If document is already loaded

window.setTimeout(f, 0); // Queue f to be run as soon as possible

else if (window.addEventListener) // Standard event registration method

window.addEventListener("load", f, false);

else if (window.attachEvent) // IE8 and earlier use this instead

window.attachEvent("onload", f);

}

// Start by setting a flag that indicates that the document is not loaded yet.

onLoad.loaded = false;

// And register a function to set the flag when the document does load.

onLoad(function() { onLoad.loaded = true; });